Gas and air mixer for hydrocarbon engines



March 14, 1933. w. s. RAWERS GAS AND AIR MIXER FOR HYDROCARBON ENGINES FIled March 21, 1930 Patented Mar. 14, 1933 \UNITED STA WILLIAM B. BAWEBS, O1 CHICAGO. ILL'HTOIB, ASSIGNOB, BY IDIBEUI. AND AS- SIGNHENTS, TO GAS TION OI ILLINOIS CORPORATION, 01' CHICAGO, ILLINOIS, CORPORA- eas AND m roe mnooon mamas Application am we e1, ie'eo. semi as. 431,971.

This invention relates to carbureting systems for hydrocarbon engines and has special reference to the provision of a gas and air mixer or economizer for supplying additional air to the normal mixture delivered by the carburetor, under engine operating conditions other than idling. g

In the operation of hydrocarbon or internal combustion en 'nes of the variable speed and load type, s ow speed idling to be smooth requires a richer mixture than the most economical mixture for-operation under normal'load. It is accordingly an object of this invention to provide an 1m roved and simplified economizer or gas an air mixer for supplying and properly mixing additional air with the carbureted fuel and air mixture delivered b the carbureter, the functioning of the mixture being controlled to correspond in a predetermined relationship to the movement of the normal throttle control of the engine.

It is a further object of this inventionto provide an improved and sim lified economizer attachment for the car uretion systems of internal combustion e es-wherein the operation of the economlzer is yieldeconomizer of entering air is given a swirhng motion to ingly controlled by the throttle position and wherein the relative point of o nin and extent of opening is readily ad uste relative to throttle movements;

a It is also an object of this invention to provide an im roved gas andair' mixer or e class described wherein the facilitate even mixture with the already carair mixture leaving the existing engines.

Other and further important objects. of this invention will be apparent from the disclosures in the specification and-the accompanyin drawing.

J Ontfie'drawing: I.

Figure 1 is' a fragmentary elevation ofadjacent parts of a carburetor and showing the application thereto of a device embodying the eatures of this invention;

Figure 2 is a central section of the manifold and device; and

Figure 3 is an enlarged section on the linethe arrow alongside the rod in Figure 1. The

carburetor body 10 terminates in amounting flange 16 engaging a similar flange 17 associated with the intake manifold riser 18, the two flanges being secured together by suitable capscrews 19.

A threaded aperture 20 is formed in the carburetor body above the openin ed e of v the throttle as this position is pre erre due to thedeflecting action of the inclined throttle which throws the carburetted fuel and air mixture towards the left side of the passage 11 at partial throttle openin tion of the device 0 this invention, which comprises a body 21 threaded at one end to Thejaperture20 rovided ior the recep-' engage in-the aperture 20 and passaged at 22 for the inflow of air. A valve seat 23 is formed in the passage and the body'to the left of the valve seat is formed with an enlarged threaded aperture forming-a continuation of the passage 22. A valve 24 cooperates with the seat 23 and has a stem 25 of reduced diameter guided at 26 in p a valve guide 27 threadingly engaged in the passage 22. The valveguide is formed with a chamber 28 between the actual guide portion andthe valve 24, this chamber being of suf-.

tracted into the chamber. A spring 30 is -ficieht size to permit the flow of air-around the edges of the valve when the valve is re-- positioned in the chamber behind the valveso I that sum or out movement of the valve guide in the threaded part of the passage 10p serves to increase or decrease the spring pressure serving to close the valve. Entrance ports 31 are formed in the riphs ery of the valve guide about the cham r 28,

5 these ports being so directed that they are substantially tangential with respect to the 4 assage 22 so that the air entering the chamr 28 and passage 22 is given a pronounced swirlin or spiral flow as indicated by the arrows 1n Figure 2, such a flow having been found to materially improve the even distributing of the economizer air in the carburetted mixture delivered bythe carburetor.

In the o ration of the device of this invention it is desirable to have the valve'24 closed while the throttle is positioned for idling or slight load conditions and to open the valve under normal conditions of load when the throttle has been at least partially 0 ned. Thus it is desirable to co-rela'te t e throttle control and the control of the valve of this invention.- To this end a 'sprin 32 is connected between the external end 0 the valve stem and a clip 38 secured to the throttle operating rod. Since the spring 32; acts op its in direction to the spring 80; and b0 springs. are adjustable; spring 30. as hereinbefore described and spring 32 by relocating the clip 33 on the throttle rod; a

very close adjustment is obtainable of the relative point of opening and the extent of opening of the valve 24. This adjustment is predetermined by suitable tests durin the in stallationfof the device in order too tain the most economical fuel consumption under normal conditions. i

I am, aware that many changes may be made and numerousdetails of construction may be varied through a wide ran without departin from the principles of fiis invention, an I', therefore, do not purpose limiting. the patent granted hereon otherwise than necessitated b the prior art.

vI claim as ollow 1. In combination with a carbureter and throttle, a port opening'into the carburetor above the leading edge of the throttle when the latter is in idling position, a passaged bod engaged in sai port, a valve seat in sai passage, a valve cooperating with said valve seat, a valve stem extending outwardl from said valve a valve guide engaging sai valve stem and having a chamber to receive said valve when 0 ned, a spring in said chamber acting against the valve to close the same, said valve guide bein threadingly engaged with said passaged ody to vary the compression of said sprin and offset radial air rts in the valve gui e and opening into sai chamber substantially tangentially thereto whereby to create a swirling motion of the entering air prior to entry into the carbureter. carbureter and 2. In combination with a "'05 throttle, a port opening into the carbureter above the leading edge of the throttle when the latter is in idlin position, a passaged bod engaged in sai port, a valve seat in said passage, a valve cooperating with said valve seat, a valve stem extending outwardly from said valve, a valve guide engaging said valve stem and having a chamber'to receive said valve when 0 ned, a spring in said chamber acting against the valve to closethe same, said valve guide beingotgireadingly engaged with said passaged to vary the compression of said spring, 9 set radial air ports in the valve guide and opening into saidchamber substantially tangentially thereto whereby to create a swirling motion of the air prior to enterin the carbureter, and means for simultaneous y operating the valve stem and the throttle.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

Illinois. 4 I

- A WILLIAM B. RAWERS. 

